package com.jyh.service;

import com.jyh.dao.StockDao;
import com.jyh.entity.Stock;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * @author JYH
 * @version 1.0
 * @date 2022/12/8 13:30
 */
@Service
public class StockService_redisson {

    @Autowired
    private StockDao stockDao;

    @Autowired
    private RedissonClient redisson;

    public String decrement(Integer productId) {

        //获取锁对象
        RLock lock = redisson.getLock("product::" + productId);
        //必须为30秒
        lock.lock(30, TimeUnit.SECONDS);
        try {
        //1.查询商品的库存
            Stock stock = stockDao.selectById(productId);
            //2.判断库存是否足够
            if (stock.getStock() > 0) {
                stock.setStock(stock.getStock() - 1);
                int i = stockDao.updateById(stock);
                System.out.println("商品编号为:" + productId + "的商品库存剩余:" + stock.getStock() + "个");
                return "商品编号为:" + productId + "的商品库存剩余:" + stock.getStock() + "个";
            } else {
                System.out.println("商品编号为:" + productId + "的商品库存不足。");
                return "商品编号为:" + productId + "的商品库存不足。";
            }
        }finally {
            lock.unlock();
        }



    }
}
